Which is why you need to perform the conversion using the ConvetToDateTime method that PowerShell adds to every WMI object.

Get-CimInstance automatically performs the conversion for you.

The other interesting part is the filter

"Drive='C:' AND Path = '\\users\\$user\\'"

Note that it’s wrapped in double quotes. Each of the values is a string so HAS to be in single quotes. Also note that you need to double the \ characters as WMI treats a single \ as an escape character so you have to escape the escape character.